https://matteocampagna.com/en/registry/equipment/arrow-spin-flight-speed Changes to this claim in Matteo Campagna's evidence registry: its status, its year-by-year history, revisions of the page. en-gb https://matteocampagna.com/en/registry/equipment/arrow-spin-flight-speedThe measurements at several speeds all come from one Japanese research group, which put arrows in a magnetic suspension wind tunnel, where the arrow is held without any support, and then launched them in free flight, filming them with high-speed cameras. In 2011 the spin rate rises in proportion to the flight speed, both in the tunnel and in flight, and, in the tests with the enlarged X10 model, does not change between an ogive point and a tapered one, although with that model the spin in the tunnel was much lower than in flight. In 2012 the same group puts a number on it: the spin parameter, the ratio between the speed of the spinning surface and the flight speed, stays between 0.028 and 0.033 both in the tunnel and in flight, with differences too small to affect drag. For a sense of scale, an archery arrow spins about sixty times a second, against the four of the crossbow bolt with which the same group had begun its measurements, precisely because it spins slowly and flies like a rigid body. Outside that group there is an Australian model from 2011, checked with a shooting machine on a compound arrow: at its steady rate the arrow makes one turn every 2.12 metres, so the spin rises with speed, but the proportionality comes from the formula rather than from shots at different speeds, and it does not deal with the point. The picture is consistent but narrow: the direct measurements come from a single group, few arrows, and the part about the point rests on the figures of a single paper.claim:rotazione-freccia-velocita:revision:2026-02-06:2Fri, 06 Feb 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/arrow-spin-flight-speedclaim:rotazione-freccia-velocita:new_claim:2026-02-05:riportatoThu, 05 Feb 2026 08:00:00 GMT